In this Nov. 25, 2014 photo, paleontology student Hillary McLean pieces back together the tusk of an ancient mastodon, part of an extensive discovery unearthed from Snowmass, Colo., inside a workroom at the Denver Museum of Nature and Science. A trove of ancient bones from gigantic animals discovered in the Colorado mountains provides a fascinating look at what happened about 120,000 years ago when the Earth got as warm as it is today, scientists say. (AP Photo/Brennan Linsley)
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